Water-tube steam-boiler



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(No Model.) I 2 Sheets-SheetZ. A. S. KROTZ.

WATER TUBE STEAM BOILER.

No. 585,680. Patented July 6,1897.

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UN TED STATES PATENT OFFICE.

ALVARO KROTZ, OF SPRINGFIELD, OHIO, ASSIGNOR TO \VALTER S. LUCAS, 'OF CHICAGO, ILLINOIS.

WATER-TUBE STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 585,680, dated July 6, 1897.

Application filed April 6,1896. Serial No. 586,431. (No model.)

To all whom it may concern.-

Be itknown that I, ALVARO S. KROTZ, a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Water-Tube Steam-Boilers, of which the following is a specification.

My invention relates to certain new and useful improvements in water-tube steamboilers.

The particular object I have in view is to produce a cheap, economical, safe, anddurable boiler. I accomplish these results, first, by arranging the boiler in separate sections (which I term banks.) placed vertically within vertical surrounding walls; second,

by providing a circulating medium within each bank, preventing water-spray, so common in water-tube boilers, and also providing means for producing an uneven water-level namely, highest over the down-current tubes andlowest in that part of the drums where the steam is discharged to or from the drums; third, by partially or wholly protecting the down-current tubes from the heat; fourth, by supplying the feed-water to the farthest bank from the furnace and at or near the upper ends of the circulating-tubes, and feeding the other banks likewise, but from the water of circulation from its succeeding bank, this increasing circulation; fifth, by the use of vertical banks and vertical separatingwalls, and out of contact with the tubes and bottom drums, so that the accumulation of soot is below the bottom drums and removable from side doors.

In the accompanying drawings, Figure 1 is a vertical sectional View of my improved boiler, the section being taken on the line 00 a; of Fig. 2. Fig. 2 is a transverse sectional View on the line w in Fig. ,1. N Fig. 3 is a partial side View with outer wall removed, as shown on the right of Fig. 2. Fig. 4 is a partial top view showing feed-pipe connections, Figs. 5 and 6 showing a modified form of protecting the down-current tubes from the heat, also more clearly showing the action of the deflecting-plates. Fig. 7 is a horizontal sectional view showing a further modification of the manner of protecting the down-tubes.

' Like parts are represented by similar let ters of reference in the said views.

In the said drawings, 7) represents a firebox, Z) the grate-bars, and b the ash-pit.

Between each set of drums and their connecting-tubes I construct walls 0, extending to the same height and connected to the side walls 0. This forms a series of narrow ways or rooms, into which are located the banks Nos. 1, 2, and 3, respectively. The bottom drums 61 being of a smaller diameter than the distance between the walls 0, an opening 0 is provided. Drums d and d and tubes 01 01 form a complete bank. The end tubes d are partially or wholly protected from the heat either by placing walls a between them and the interior of the structure, in which case a wall a may be provided, or a recess is made within the inner side of walls 0, within which the tubes (i are located, as shown in Figs. 5 and 6. When the tubes 01 are placed outside the walls c, they may also be placed in a recess in the outer side of wall. 0, as shown in Fig. 7, in which case a piece of sheet metal or other material 0 is used for protecting the tubes from external harm. This construction is preferable to the wall 0 A flexible packing c is placed around the drums d and with the opening in the walls 0, so as to allow a slight movement and yet prevent air-leak. The tubes 613 are preferably curved, as shown in Fig. 3, allowing of independent contraction and expansion.

The banks are supported by the drums d wise the feed-pipes d are connected on a line (or nearly so) with the down-current tubes d so that the feed-water upon entering the first bank first flows down the tubes d aiding the circulation, the partition (1 preventing it from flowing into the tubes 0?, likewise the feeding of Water from bank No. 1 to bank No. 2 and from bank No. 2 to bank No. 3. Each drum is provided with the usual manhole. The banks are provided with blow-off connections d Below the drums d and through the side walls 0 c I place doors or openings 0 for the removal of soot and ashes. The cross-walls 0 each have an archway or opening 0 but in opposite ends, through which the gases pass.

It is obvious that if the tubes D were extended through and into the drum D and bent toward the circulating-tubes D the same results would be accomplished.

Having thus described my invent-ion, I claim 1. In a water-tube boiler, the combination with a series of banks each consisting of tubes to. which are connected a steam and a mud drum, the drums extending through the side walls, a recess within the outside of the side walls, and located between the ends of said steam and mud drums, of the same bank, said recess being in line with the generating-tubes, and down-current tubes located within said recess and connecting the drums together of the same bank.

2. I11 a water-tube boiler, the combination with a bank of tubes to which are connected a steam and a mud drum, the drums extending through the side walls, a recess within the outside of the side Walls and located between the ends of said steam and mud drums, and down-current tubes located within said recess and connecting the drums together, and a metal or sheet covering over said recess.

3. In a water-tube boiler, the combination with upper and lower drums connected together by tubes, the banks thus formed being supported crosswise between the side walls, by the upper drums resting on their ends upon the side walls, the end tubes being partially protected from the heat by being located within a recess within the inside of the walls over which the ends of the drums pass, sub- .stantially as shown and described.

4. In a water-tube boiler, the combination with upper and lower drums connected together by tubes, a part of the tube being located within a recess within the inside of the side or end walls, and deflecting-plates in the upper drum placed at an angle over the generating-tubes and below the water-line, and a cross partition-wall placed between the generating and circulating tubes the top of said partition-wall being below the water-line.

5. In a water-tube boiler the combination with a series of banks consisting of up-current and down-current circulating-tubes, the down-current tubes being partially or wholly protected from the heat, deflecting-plates suspended crosswise in the drum and at an angle and above the generating-tubesand below the water-line, and a partition-wall placed between the circulating and generating tubes the top of said partition being below the waterline, substantially as shown and described.

6. In a water-tube boiler, the combination with a series of banks of tubes, each bank connected to a mud-drum below and a steamdrum above, deflecting plates or guides sus pended crosswise in the drum and placed at an angle above the up-current tubes, said plates being turned or leaned toward the down-current tubes, and adivision-wall between the outside row or rows of tubes and the generating-tubes, the upper portion of the division-wall being below the water-line, and feed or equalizing pipes entering the drum Within the space occupied by the downcurrent tubes.

7. In a water-tube boiler, the combination with a series of banks of tubes connecting together mud and steam drums, the tubes at the end being a distance from the succeeding tubes and between which a wall is located,

said drums extending through, or over the wall, said end tubes being parallel with the wall buton a curve crosswise with the drums, substantially as and for the purpose specified.

8. In a water-tube boiler, the combination with double side walls upon which are sup ported a series of banks each consisting of steam-drums a mud drum or drums, and upcurrent and down-current water-circulating tubes connecting the drums together, the down-current circulating-tubes being located between the double walls, the said banks placed parallel with each other, but crosswise with the double side walls the ends of the drums passing through the inner side walls.

9. In a water-tube boiler, the combination with a series of banks, each consisting of two drums and up-current and down-current circulating tubes connecting the drums together, said banks being surrounded by vertical walls, the ends of the top drums resting on the side walls and supporting the bank, feed-water connections to the farthest bank from the furnace and equalizer connections between the banks, substantially as and for the purpose specified.

10. In a water-tube boiler, the combination with a series of banks, each consisting of two drums and their connecting-tubes, means as described for producing ciroulation,the banks being surrounded by vertical separating or cross walls and end walls, and connected together by water-feeding pipes between the upper drums and in that part of the drums to which are connected the down-current tubes, the feed-water entering the farthest bank from the furnace and enter the space occupied or drained by the down-current tubes of said farthest bank, steam-pipe connections above the water-line and between all the top drums, openings through the crosswalls at opposite ends, and a space between the cross-walls on a line with the bottom drums greater than the diameter of said bottom drums.

together by u p-current and down current circulating-tubes, the down-current tubes being separated from the up-current tubes by a partitionwvall, the top of said wall being below the Water-line and feed-in-water connections into the space occupied by said downcurrent tubes. 7 i

In testimony whereof I have hereunto set my hand this 3d day of April, A. D. 1896. ALVARO S. KROTZ.

Witnesses:

OLIVER H. MILLER, LINN COCHRAN, Jr. 

